chile



C. M. MALSCH AND C. H. GILSON.

METALLURGICAL PROCESS. AePLlcmon FILED NOV. r, 1916.

Patented May 13, 1919.

8 m H N WITNESSES Specifi on n fox/"ember Ti) (1Z5 105mm if a it mm 1d. ores.

:1 simple, ml. which par Ma; from 13001 Your hZ'CiWH. n 0.1" leaching; 01" ores m 10 obtain a solution 01" him 21 and (1211M mlulflc mmpoumh 1m w'msfi fih I Mucip' tum. of the sulfa '41s 1115 of 1mm sulfirl.

me: imporinnce that ha L was? immtulnvml mm Mam-(aim the 1'0 1; minu'1cc and i t solufiun in water t be made iinufi- H33. 0118181 to m $111308- thui: 11m?- 01'0 mm of time oxidizii 111;}; in ing; 1111; m

in tho mmw I;

fitters laten's.

2 1916. Seria'il 'o 1311,1198.

1e om to be treat iwsfmffluly a sulfid (me. it 55 (MT ppm? r0111 "Xhhfth it is; (h crusher to Lh brcdmv 11%) 01-0, is d live 1 mili which @Iplt'jhaigfiES Into a 'nu. Wham a.

he (Wm 0W from") to a mm which 11v 3W5 into the trough i- 110 be LfiZlaYllOd to Him. From 1% classifier the, 0m l 1'0 Ella fumzu'ze "r furnaces S.

rec:

r. :z, Czmk 5) :1 mixing m0 7.1x lung; agent we 3; DTHFCZQ'QIJ cromlimunc pmfcmbly a xntly the t of the sulfuric {he 'fiu'num i V h:- the badiiif! 1911c are :uhiaad Hon. milks flu! Em m ()1? by n that 1 5111- 2 50111- fore, can be separated by filtration.

The copper sultiil is pricipitatech the iron sulfate remaining in solution, and, there- 12- 1/ i adding sodium suliid to the solution of iron sulfate an iron sullid results as a precipitate with a soluhie sodium sultate in solution again separable by filtration i l etiU Na i l etfidd la fifi .ihe sodium. null to can then be reduced From the ahove it will be seen that the quantity of sodium Hilllhl nee Vary for the re gei'iera'tion ot' the iron sulfid is comparz tively little, in View of the fact that, 1t

only necessary to add at, suitable iuteiw'als a small quantity ot sodium sulfid for the deteiioration of that, becoming" contaminated by impurities during the reactions and losses unavoidable in the reaurtion. The sodium. sulfid can be easily obtained by the reduction of a sodium sulfate with carbon, the sodium sulfate heing chaip and easily ohtainahle. is self-evident that the iron sullid may he obtained in any other suitable way and' used for precipita ion of the met;- ale to be extracted from the It is evident; tint the niti ous C(Jii'lPG'LllMl.

which are found in. the gases COIIllfig from the ores in the furnace can he regenerated in the well l nown way and used over age I in the ini oil hula-Ear e acid The most important part of our metallic process in the introduction to the roaming furnace of a nitrate so. on to react with the roasted ore to produce a sulfate which can he easily leached. The other important, point of. the method is the preci )itation of the metal from the solution by iron sulfid.

Ti e claim:

1. A metallur g'iail 1'JI'(C( 5S which consists in roasting suh'id 0 es, introducing nitrates; in solution into the roasting zone wherein the roasting of the ore is somewhat advanced to form sulfates of the metals present, in the ore, leaching the sulfates orn'ied, and pre- ('ipitalingj'said leached metals from the solution,

nietallurgi 'al process in roasting sulfid ores to town sulfur (lion (l, introducing moisture and an oxidizing agent into the roayingz zone, wherein the roasting of the ore i. noniewha c advanced, to transform the sulfur diozcid into sulfuric acid to cause the name to react with the l'OilhltHl ore tot'orni sullatca, leaching}; the lcfillli'lll ff sulfates" and precipitai-ing the leached metals from the solution 3. it metallurgical process which consists in ro ing aultia' ores to form exulfur diox-itl, introducing moisture and nitrous; oxidizing coinpoui'ids into the roasting 2 .01 c where the roasting oi the ore is somewhat, advanced to transform the sulfur dioxid into sulfuric acid which will react with the roasted ore to form sulfates, leaching the resulting sulfates, and precipitating the leached metals from the solution.

l. it metallurgical process which consists in roasting suhid ores to form sultur dioxid, introducing moisture containing an oxidizineagent, in solution into the roasting zone, wherein the roasting of the ore is somewhat advanced, to i'liLDHfUilll the sulfur dioxid into sulfuric acid which will raict, with the roasted ore to form sultaica leaching the resulting: sulfates, and precipitzating the leached metals t "(no the IKIlllillfllh which consists 

